(Photos: Nemo's Garden)
To grow, plants need stable temperatures, exposure to sunlight, water, and protection from parasites. While scuba diving off the coast of Italy, Sergio Gamberini had an idea about how he could provide all four: he could build greenhouses underwater.
Thus was born Nemo's Garden. This project has erected lightweight offshore greenhouses. The plants are close enough to the surface of the water that they receive sunlight. The seawater evaporates inside the canopy to provide fresh water. And predatory insects can't reach the plants.
This sustainable form of agriculture can make previously unused coastal areas agriculturally productive. Nemo's Garden offers large greenhouses like the ones you see above, as well as smaller, hobbyist greenhouses that house single plants.